build(deps): update dependency com.google.cloud:google-cloud-shared-config to v1.7.6 (#1961)

Author: renovate-bot

google-cloud-pubsub-bom/pom.xml

@@ -8,7 +8,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-shared-config</artifactId>
-    <version>1.7.5</version>
+    <version>1.7.6</version>
   </parent>
 
   <name>Google Cloud pubsub BOM</name>